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SHARE-BASED COMPENSATION - Options to Employees (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2010 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2013
SHARE-BASED COMPENSATION |  |  |  |  |
Maximum aggregate number of shares to be issued | 2,330,000 |  |  |  |
Annual percentage increase in authorized shares on the first day of each of 2007, 2008 and 2009 prior to the year of amendment for awards other than incentive option shares | 1.00% |  |  |  |
Annual percentage increase in authorized shares on the first day of each calendar year from the year of amendment for awards other than incentive option shares | 2.50% |  |  |  |
Number of shares to be granted after expiration |  | 0 |  |  |
Expiry term of share options |  | 10 years |  |  |
Number of Options |  |  |  |  |
Granted (in shares) |  | 0 | 0 | 0 |
Options |  |  |  |  |
Options to Employees |  |  |  |  |
Total unrecognized compensation expense related to share-based compensation awards |  | $ 0 |  |  |
Recognized compensation expense |  | $ 0 | $ 0 | $ 44 |
Term for which the entity is listed |  |  |  |  | 7 years
Assumptions used to estimate the fair value of stock options granted |  |  |  |  |
Dividend yield (as a percent) |  | 0.00% |  |  |
Number of Options |  |  |  |  |
Options outstanding at the beginning of the period (in shares) |  | 369,173 |  |  |
Granted (in shares) |  |  | 0 | 0 |
Exercised (in shares) |  | (74,521) |  |  |
Forfeited (in shares) |  | (70,150) |  |  |
Options outstanding at the end of the period (in shares) |  | 224,502 | 369,173 |  |
Options vested or expected to be vested at the end of the period (in shares) |  | 224,502 |  |  |
Options exercisable at the end of the period (in shares) |  | 224,502 |  |  |
Weighted Average Exercise Price |  |  |  |  |
Options outstanding at the beginning of the period (in dollars per share) |  | $ 15.97 |  |  |
Exercised (in dollars per share) |  | 10.33 |  |  |
Forfeited (in dollars per share) |  | 41.66 |  |  |
Options outstanding at the end of the period (in dollars per share) |  | 9.82 | $ 15.97 |  |
Options vested or expected to be vested at the end of the period (in dollars per share) |  | 9.82 |  |  |
Options exercisable at the end of the period (in dollars per share) |  | $ 9.82 |  |  |
Weighted Average Remaining Contract Terms |  |  |  |  |
Options outstanding at the end of the period |  | 2 years | 2 years |  |
Aggregate Intrinsic Value |  |  |  |  |
Options outstanding at the end of the period |  | $ 1,026 | $ 2,068 |  |
Total intrinsic value of options exercised |  | $ 256 | $ 605 | $ 2,643 |

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- Definition Represents the annual percentage increase in authorized shares on the first business day of each of 2007, 2008 and 2009 prior to the year of amendment for awards other than incentive option shares. + References No definition available. + Details
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- Definition Represents the number of awards that may be granted under the share incentive plan after the expiration date of May 8, 2021. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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